3 Phase Power Calculator kW to Amps

3 Phase Current Formula:

\[ I = \frac{P_{kW} \times 1000}{V \times PF \times \sqrt{3}} \]

Current (Amps):

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1. What is a 3 Phase Power Calculator kW to Amps?

Definition: This calculator converts three-phase power in kilowatts to current in amperes.

Purpose: It helps electrical engineers, technicians, and electricians determine the current draw for three-phase electrical systems.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ I = \frac{P_{kW} \times 1000}{V \times PF \times \sqrt{3}} \]

Where:

\( I \) — Current (amperes)
\( P_{kW} \) — Power (kilowatts)
\( V \) — Line-to-line voltage (volts)
\( PF \) — Power factor (unitless, 0-1)

Explanation: The formula converts kW to watts (×1000), then divides by the product of voltage, power factor, and √3 (approximately 1.732) for three-phase systems.

3. Importance of Current Calculation

Details: Accurate current calculation ensures proper sizing of wires, circuit breakers, and other electrical components for safety and efficiency.

4. Using the Calculator

Tips: Enter the power in kW, line-to-line voltage (default 400V), and power factor (default 0.8). All values must be > 0, with PF between 0.01 and 1.

5. Frequently Asked Questions (FAQ)

Q1: Why is √3 used in the formula?
A: The √3 factor accounts for the phase difference in three-phase systems (120° between phases).

Q2: What's a typical power factor value?
A: Motors typically have PF of 0.8-0.9, while resistive loads have PF=1. The default 0.8 is common for industrial loads.

Q3: What voltage should I use?
A: Common three-phase voltages include 208V, 400V, 480V. Use your system's line-to-line voltage.

Q4: Can I use this for single-phase systems?
A: No, use a different formula (I = P×1000/V×PF) without the √3 factor for single-phase.

Q5: How does power factor affect current?
A: Lower power factor means higher current for the same real power, requiring larger conductors.